title: Incomes, attitudes, and occurrences of invasive species: an application to signal crayfish in Sweden.
abstract: This article analyzes and carries out an econometric test of the explanatory power of economic and attitude variables for occurrences of the nonnative signal crayfish in Swedish waters. Signal crayfish are a carrier of plague which threatens the native noble crayfish with extinction. Crayfish are associated with recreational and cultural traditions in Sweden, which may run against environmental preferences for preserving native species. Econometric analysis is carried out using panel data at the municipality level with economic factors and attitudes as explanatory variables, which are derived from a simple dynamic harvesting model. A log-normal model is used for the regression analysis, and the results indicate significant impacts on occurrences of waters with signal crayfish of changes in both economic and attitude variables. Variables reflecting environmental and recreational preferences have unexpected signs, where the former variable has a positive and the latter a negative impact on occurrences of waters with signal crayfish. These effects are, however, counteracted by their respective interaction effect with income.
authors.affiliation: Department of Economics, Swedish University of Agricultural Sciences, Box 7013, 750 07 Uppsala, Sweden. ing-marie.gren@ekon.slu.se
authors.forename: Ing-Marie
authors.initials: IM
authors.lastname: Gren
authors.forename: Monica
authors.initials: M
authors.lastname: Campos
authors.forename: Lennart
authors.initials: L
authors.lastname: Edsman
authors.forename: Patrik
authors.initials: P
authors.lastname: Bohman
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000502:physiology*; D003247:Conservation of Natural Resources / Q000379:methods*; D017753:Ecosystem; D005398:Fisheries / Q000191:economics*; D017059:Models, Econometric; D011157:Population Dynamics; D012044:Regression Analysis; D012959:Socioeconomic Factors; D013548:Sweden